Voluntary exposure to health communications.
D000328:Adult; D000367:Age Factors; D000368:Aged; D001294:Attitude to Health; D003142:Communication; D003710:Demography; D004522:Educational Status; D005191:Family Characteristics; D005260:Female; D006266:Health Education; D006801:Humans; D008297:Male; D008875:Middle Aged; D011634:Public Health; D011643:Publishing; D012494:Sampling Studies; D012959:Socioeconomic Factors; D013690:Television; D014481:United States